uniform vec4 color;
uniform float speed;
czm_material czm_getMaterial(czm_materialInput materialInput){
  czm_material material = czm_getDefaultMaterial(materialInput);
  float time = czm_frameNumber * speed /200.;
  vec2 st = materialInput.st;
  material.diffuse =  color.rgb * 1.2 + abs(sin(time)) * 0.5;
  material.alpha = color.a * (1.0-fract(st.t)) * 0.7;
  return material;
}